On 07/09/2013 06:17 AM, John Reiser wrote:
Yes it does, because the rest of the system might not be quiescent during the first sync.
While that is certainly true, "sync" doesn't make the rest of the system quiescent.
The first sync disturbs the system with an impulse of activity. This may cause the rest of the processes to react in strange an wonderful ways, including creating many changed-and-unwritten blocks.
Now I can't tell if you're joking.
The second sync cleans many of these. Of course this is a classic race condition which might never get resolved, but the probabilities are much more favorable after the second sync than after only the first.
That's just silly. The only thing that would make a second sync flush any more blocks than the first one is continued system activity, or in other words, "time." Syncing a second time may flush additional blocks, but no more blocks than if you's simply skipped the first.
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